Integrate with GH workflow linter

[ligurio]

There are YAML configs for Github workflows ¹.
It would be nice to integrate syntastic with linter for GH workflows format ².

Footnotes

1. https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions ↩

2. https://github.com/rhysd/actionlint ↩

[lcd047]

Please read: https://github.com/vim-syntastic/syntastic#deprecation